Technically a 4-inch filter will physically fit inside a 5-inch filter housing, but it is highly recommended to use the exact size your system was designed for (5-inch).
If you're struggling money wise get one 16x25x1. But that is going to need changed more often and doesn't allow as much airflow as a 4” would.
Yes, furnace filters need to be the exact size. Using an incorrect filter creates air gaps that allow unfiltered dirt to bypass the filter, or it can force the system to work harder, which drastically reduces energy efficiency, strains the HVAC motor, and risks system damage.
For most Goodman furnaces, the ideal MERV rating is between 8 and 11. This range provides a healthy balance between excellent indoor air quality and necessary airflow. Using filters with a MERV rating higher than 13 can restrict airflow, causing your system to overwork, overheat, or fail.
Quick Answers: Furnace Filter Thickness
Filter thickness determines how much surface area is available to capture particles and how long your filter will last—a 4-inch filter has nearly 4x the filtration capacity of a 1-inch filter, meaning better air quality and fewer replacements.
The most common standard furnace filter size is 20" ×cross× 25" ×cross× 1". Other highly common standard sizes include 16" ×cross× 25" ×cross× 1", 16" ×cross× 20" ×cross× 1", and 20" ×cross× 20" ×cross× 1".
A 4-inch furnace filter typically lasts between 3 to 6 months, though some high-capacity options can last up to 12 months. Because of their thickness and larger surface area, they hold significantly more dust and debris than standard 1-inch filters, requiring far fewer replacements.
The term "Goodman lawsuit" usually refers to the ongoing litigation involving the bankruptcy of the telecom company Goodman Networks and FedEx, or the historical class-action and federal cases regarding defective HVAC evaporator coils manufactured by Goodman Global.
It depends on the HVAC system's capacity and design. MERV 11 filters capture smaller particles than lower-rated filters, which can slightly reduce airflow if the system isn't optimized for higher filtration levels. However, most modern residential systems can handle MERV 11 without significant issues.
Ultravation Filter Sizes & Model Numbers
Notice how the same nominal size (like 16x25x5) has different actual dimensions across brands? This is why you should always search by model number or actual size when ordering whole-house filters.
The answer is yes... and no. Thicker air filters can offer important advantages such as longer lifespan and greater dust-holding capacity, but only when your HVAC system is designed to handle them. Simply swapping a 1-inch filter for a 5-inch one doesn't guarantee better air quality or system performance.
Damage to the HVAC System
Overheating Components: When the airflow is restricted due to a clogged or oversized filter, the HVAC system must work harder to pull air through the filter. This increased workload can lead to overheating, particularly in components such as the compressor and the fan motor.
Yes, you can use a 1-inch filter instead of a 5-inch one, but only if you fill the extra space with an approved spacer or media rack so the filter fits tightly. Never stack multiple 1-inch filters together to fill the gap, as this severely restricts airflow and can damage your HVAC system.
While an average filter is one inch thick, you can choose one that is up to four inches thick. This extra depth gives the filter more room for airflow. That means that as the filter collects dirt and other debris from your air, it won't restrict the airflow in your furnace as much.
Change your 16×25×4 furnace filter every 6 to 12 months. Because of its 4-inch thickness, it holds more debris than standard filters, allowing for a longer lifespan. However, the exact timing depends on household factors like pet ownership and overall usage.
Yes, your air filter needs a very precise fit. It does not need to match exact fractional measurements (like 19.5" vs. 19.75"), but it must be the exact "nominal" size assigned to your system.
Yes, you can temporarily use a 16x25x1 filter in place of a 16x25x4 filter as a quick fix, but it is not recommended for long-term use. Using a 1-inch filter in a 4-inch slot requires a proper seal to prevent unfiltered air from entering the system, and it will require much more frequent replacement (every 30 days) compared to a 4-inch filter.
The most common furnace filter size is 𝟏𝟔×𝟐𝟓×𝟏 inches, closely followed by 𝟐𝟎×𝟐𝟓×𝟏 inches and 𝟐𝟎×𝟐𝟎×𝟏 inches.
Yes, moderately priced, mid-range filters (MERV 8 to 11) are worth the money, but ultra-expensive, high-MERV filters are usually not. Overpaying can actually restrict airflow, lower energy efficiency, and cause expensive damage to your HVAC system.
The choice between a MERV 8 and MERV 11 filter depends on your household's health needs and your HVAC system. A MERV 8 is best for basic protection and system longevity. A MERV 11 is ideal if you have pets or suffer from mild allergies, provided your HVAC system can handle it.
Most washable furnace and AC (HVAC) filters have a MERV rating between one and four, but it's possible to find higher-rated reusable filters. A well-maintained washable filter offers the same performance as a disposable filter of the same MERV rating.
A MERV 14 or higher air filter can create more resistance in airflow than a residential HVAC system is designed to handle. This reduction in the air flow to your HVAC system can worsen the air quality in your home, as well as put too much pressure on your AC system.
Understanding Goodman's Manufacturing Origins
While some components and certain product lines are manufactured in China, Goodman's primary manufacturing hub remains in Houston, Texas, where the company has been producing HVAC equipment since 1982.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
A Goodman furnace typically lasts 15 to 20 years. However, achieving the upper end of this lifespan—and potentially stretching it toward 25 years—heavily depends on regular maintenance, a quality installation, and your local climate.